FMR STUDY OF REDUCED BA-FERRITE

FMR spectra and saturation magnetization versus temperature curves hav e been measured in Co-Ti-Sn substituted Ba-ferrite samples which have been reduced in a hydrogen atmosphere at temperatures up to 380 degree s C. In general, except for the starting material and the samples whic h have been reduced at 380 degrees C, the FMR spectra and the M(S) ver sus temperature curves can be represented as a sum of non-interacting Ba-ferrite and alpha-Fe components. A model has been developed to expl ain the tilted easy axis which has been previously observed from torqu e curves which assumes a non-interacting mixture of Ba-ferrite with fi rst-order uniaxial anisotropy and alpha-Fe with both crystalline and n egative shape anisotropies.